C# 加密解密字符串

来源：互联网发布：淘宝宝贝图片制作教程编辑：程序博客网时间：2024/05/17 15:36

有时候可能会用到，给数据库连接的字符串加密，让人不那么容易看出服务器的地址和帐号信息，所以大家可以用这个工具，把字符串加密，然后执行的时候解码，就可以了。方便实用。

方法一：

using System;using System.Collections.Generic;using System.Text;namespace StringEncry{    class EncodeAndDecode    {        /// <summary>        /// Base64加密        /// </summary>        /// <param name="codeName">加密采用的编码方式</param>        /// <param name="source">待加密的明文</param>        /// <returns></returns>        public static string EncodeBase64(Encoding encode, string source)        {            string enstring = "";            byte[] bytes = encode.GetBytes(source);            try            {                enstring = Convert.ToBase64String(bytes);            }            catch            {                enstring = source;            }            return enstring;        }         /// <summary>        /// Base64加密，采用utf8编码方式加密        /// </summary>        /// <param name="source">待加密的明文</param>        /// <returns>加密后的字符串</returns>        public static string EncodeBase64(string source)        {            return EncodeBase64(Encoding.UTF8, source);        }         /// <summary>        /// Base64解密        /// </summary>        /// <param name="codeName">解密采用的编码方式，注意和加密时采用的方式一致</param>        /// <param name="result">待解密的密文</param>        /// <returns>解密后的字符串</returns>        public static string DecodeBase64(Encoding encode, string result)        {            string decode = "";            byte[] bytes = Convert.FromBase64String(result);            try            {                decode = encode.GetString(bytes);            }            catch            {                decode = result;            }            return decode;        }         /// <summary>        /// Base64解密，采用utf8编码方式解密        /// </summary>        /// <param name="result">待解密的密文</param>        /// <returns>解密后的字符串</returns>        public static string DecodeBase64(string result)        {            return DecodeBase64(Encoding.UTF8, result);        }    }}

这个类，大家可以直接使用。

效果图如下：

方法二：

/// <summary>    /// MD5加密，输入明文，返回密文    /// </summary>    /// <param name="pToEncrypt"></param>    /// <returns>加密后字符串</returns>    [WebMethod(Description = "【函数描述】加密数据库连接字符串")]    public string MD5Encrypt(string pToEncrypt)    {        DESCryptoServiceProvider des = new DESCryptoServiceProvider();        byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);        //des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);          //des.IV  =  ASCIIEncoding.ASCII.GetBytes(sKey);          byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量           byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥         des.Key = key;        des.IV = iv;        MemoryStream ms = new MemoryStream();        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);        cs.Write(inputByteArray, 0, inputByteArray.Length);        cs.FlushFinalBlock();        StringBuilder ret = new StringBuilder();        foreach (byte b in ms.ToArray())        {            ret.AppendFormat("{0:X2}", b);        }        ret.ToString();        return ret.ToString();    }    /// <summary>    /// 解密连接字符串，输入加密后字符串，返回解密密后的字符串    /// </summary>    /// <param name="pToDecrypt">密文</param>    /// <returns>明文</returns>    [WebMethod(Description = "【函数描述】解密数据库连接字符串")]    public string MD5Decrypt(string pToDecrypt)    {        DESCryptoServiceProvider des = new DESCryptoServiceProvider();        byte[] inputByteArray = new byte[pToDecrypt.Length / 2];        for (int x = 0; x < pToDecrypt.Length / 2; x++)        {            int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));            inputByteArray[x] = (byte)i;        }        //des.Key  =  ASCIIEncoding.ASCII.GetBytes(sKey);          //des.IV  =  ASCIIEncoding.ASCII.GetBytes(sKey);          byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定义偏移量           byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定义密钥         des.Key = key;        des.IV = iv;        MemoryStream ms = new MemoryStream();        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);        cs.Write(inputByteArray, 0, inputByteArray.Length);        cs.FlushFinalBlock();        StringBuilder ret = new StringBuilder();        return System.Text.Encoding.Default.GetString(ms.ToArray());    }

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